code: def __init__(self, fit_start_time, fit_end_time):
      self.fit_start_time = fit_start_time
      self.fit_end_time = fit_end_time
  
file_path: qlib/examples/highfreq/highfreq_processor.py
imports: import numpy
  import pandas
  from qlib.constant import EPS
  from qlib.data.dataset.processor import Processor
  from qlib.data.dataset.utils import fetch_df_by_index
label_desc: Use image node_id 1 to create a new HighFreqNorm object from inherited base classes: Processor with example: obj = HighFreqNorm(fit_start_time, fit_end_time)